Hole spotter for collaring drill holes



Jan. 1, 1935. o. J. SCHORER HOLE SPO TTER FOR COLLARING DRILL HOLES Filed June 29. 1953 2 Sheets-Sheet 1 2 Sheets S heet 2 v 9 0 N m n J Q v mm H m 2 A T m 4 w 6 J i 1 A 4 m i a m i A N t m W/ m 222 w a? m g Jan. 1, 1935. o J. SCHORER HOLE SPOTTER FOR COLLARING DRILL HOLES Filed June 29, 1953 Patented Jan. 1, 1935 1" HOLETSPOTTER FOR ooLLAniNG nnni. HOLES 9 c Gtto Schorer, Qr eLN; J4 assigno'r to a Worthington Pump and Machinery Corpora- 'tion, New York, ;'Y., a corporation of Virginia de ineation June 29, 1933', Serial No.'67 8 50 I .a n

.6Claims.-(01.25545) i s Thisfinvention ,relatesto. rock drilling and morejparticularly .to a hole spotter for collaring drillholes.

,Anfobjectiofthepresent, invention is to provide a hole spotter ior coll'aring drill holes emb'odying a drill? bar engaging member, 7 for steadyingfthe'i drill bar during. the" spotting or starting of .a' drill hole, Whichihole spotterem: bodies means for ready and secure attachment to,,a' percussive rock dri1l,,and is so constructed that after .a hole has been spotted; it maybe IIlOVed Ollt of the way oi the drill during the finishin of the drill hole. V j v .With these' andother" objects'in view as may appear from. .the accompanying specification, the invention fcon'sistsj of various features of constructionend combination of ,parts, which will bfirstlddsciibgidzin connection with the accomdrawings showing a hole spotter of the H from embodyingf'the invention, and features liorming the invention will be specifi- .D Iil QQ Outi-n the i claims.

fwin k. p a Figu'r I a view partly in side elevation and sectionjfshowing the improved yhole spotfier iattached "toja'percussive drill.

.LFi'gurel2 a ifront end elevation of the; im-

proved;hole-.sjpotter."; a; j r v a Figure '3' isTatop plan-of the improved hole spotter. IQshowing. it in? drill bar engaging position' insolid line; and out ,of drill bar engaging po 'sition}.in. dottedflines." a Figure" 4 is" a cross section on the line 4-4' of i' 'il a V v T i Figure. B illie a detailed diagrammatic, view showing the guiding slot which guides the movementflof'the drill .bar'iengaging member. -f Fig'uirefi is alvie'w partly in side elevation and partly in-isectionof a modifiediorm of the'hole spotter; W 1 .Figure 7 is a ,front end view 01'. the modified for-in 'of theThole spotte'rgif nism of a rock drill of anyapproved type as'indicated'at 6. v r Whilethe stud 3 is shown as'formed upon the cap 4, of a cylinder 5,it is to be understoodfthat the hole spotter maybe used with'any' approved type of rock drill or percussive :drill without] departing from the spirit of this invention and thata stud-similar to the 'stud 3 may be pro} vided on the respective type of thef' if'eeding mechanism ofthe "drill;

The collar 2 is adaptedto' b'e' clamped'upon the stud 3-in any suitable manner such as by the nut 7,"for securely connectingthe supporting and attaching body or mejmber "1 to' the rock drill. A suitable plate 8' .is-iorme'd upon or attached tothe'eollar 2, and engages the-feed ing mechanismt of'the drill 6 forholdirig the collar 2 against rotary movement f v arm =9 serves as a connection between {the collar 2 and-the drill bar engaging*member carfying collarlfl; The collar 1 0 has its' axis disposedcoplanar with and at right angles to the *axis of the drill bar A as'clearl'y 'shownin Figures 1;, 2 and-3 of thedrawings. L

The drill bar engaging member 11 comprises a stem 12 which is slidably engaged axiallyiin the bore 14 ,of the collar 10. A head" l5 is formed upon the upper end of the stemfl'Zfand it has a 'pairjof upright drill bar engaging lugs 1'6 and '17 formed thereon-at diagonally opposed corners. The ,in'nerj faces of the lugs 16'and ,1"; are cut out as shown at :18 to provide bar engaging recesses "having arcuate surfaces -for snug fitting against the drill bar indicated atLAi Meansfor guiding and limiting the movement of the drill bar engaging member 11, are'pro vided; and this means comprisesta stem" 19' which'iscarried-by the stem 'l2,-'arid extends transversely therethrough, projecting; through 5 of the (drawings, the substantially rightangl'e" slot 20 has-unearth extending vertically within the collar 10,- while the second arm or -the" 510; extends transversely therein, The vertical and transverse portions of the slot"20- are connected a rounded or arc'uate portion indicated iat of a hole in rock or analogous substance, the.

handle 21 is gripped and moved upwardly. The upwardmovement, of the handle21 moves the stem 19 ,upwardly and' laterallyin' the slot 20 and at the same time moves the drill bar'engaging and guiding member 11 upwardly, rotate.

' hole to serve as a guide for the continuous drilling it a quarter turn which brings it into the The drill is then started, and after the'drill hole has been drilled to a suflicientdepth to steady the drill bar, without the requirement of other aid or guide for the drill bar, the handle 24- is pulled outwardly against the tension of the" spring 22 andmovedalong the slot 20. When the sleeve 24 of the handle 21 aligns with the lower enlarged. end 23 of the slot, 20,- the spring 21 will snap ormove the sleevef24 into the enlarged end 23 andlock the drill bar engaging and guiding memberlll in its lowered non-guiding position with the head-15 disposed substan tially-at right angles-to the position :in which it serves .as a guide for-the drill bar A. Such non-guiding position is shown in dotted lines in Figure 3' of thedrawings I From the foregoing description taken in connection with thegaccompanfing drawings, it will be apparentlthat a simple, easily operated hole spotter-ioncollaring drill holes has been provided, which I may be 'manufactured at a relatively low cost; andone which maybe permanently attached to a percussive drill assembly and moved into and out of drill bar engaging and guiding position; with a minimum efiort and with the requirement of a minimum amount n InFiguresd-to 10 inclusive of the drawings, a slight modification of the improved type of hole spotter shown in Figures 1 to 5 inclusive, is illustratedaf U lnfthis modifiedwform of the hole spotter, a supporting structure is. provided which is quite similar to the supporting structurel, in thatitcoinp'rises the attaching collar 31, which is mounted upon the stud 33. The stud 33 is attached in any suitable manner tothe percussive drill assembly. .Thefcollar 31..is clamped upon the stud'f33 by meansof the nut 34, and it is held against rotary movement byfmeans of the plate 35 which is formed on the collar 31 and engages the percussive tool rig drill. assembly. The collar .31'is connectedby a connecting web 3,6.withthecollar, 37. The collar 37 has its,

axis'disposed atj'rig'ht 'angles to the axis of the collar 31 and'it for fsa support and guide for the drill bar engaging member 38. I

f The drill bar-engaging member 38 comprises a stem39 which has a head 40 formed upon its upper end. The head 40 has drill bar guiding and "engaging lugs 41" and 42 formed'up'on-its upper surfaces and projecting upwardly therefrom; i'Ihe lugs 41 and 42 are disposed at dia- 'metrically opposed corners of the head 41 and they have their inner surfaces cut arcuately as shown at 43 for engaging. and guiding a ,drill the preferred form of the invention heretofore described, to permit the drill bar engaging and guiding member 38 to drop downwardly clear of the drill bar A, when the drill bar engaging member 38 is moved or rotated a quarter turn upon its axis, so as to permit the head 40 and lugs 4l and 42 to drop downout of! the way of the bar 'A during "the continuing of the drilling of a drill hole, after the" hole hasbeen-'started and drilled to a sufiicient depth, to cause the 'ngmovement of r the drill bar.

-- The stem'39of the drill bar engaging and guiding member 38 is slidably seated in the bore 44; off-the'collar 37' ,"a'nd it is held tightly, in adjustedpositiontherein by means of the looking ortightening' screw 45. The locking or tightening screwg45 has an operating handle 46 formed vthereon, and one end, namely the threaded" end of the screw 45, is threaded into one of, the lugs, .48 whichare formed one upon each side jof the split 49, ,,The split49 extends longitudinally of the collar 37along a portion of the length of the collar 37, and by adjusting the clamping screw 45, the-split portion of the collar.,,3fl f may be; sprung together to securely clamp thestem 39' in its adjusted position, while by loosening of ,thefclamping strain on the split portion of the collar, the clamping strain on the stem 39 may be relieved to permit the stem to move downwarlyin the bore 44. However, the stem 39 is prevented from moving downwardly in the bore 44 by means of a pin 47 which is carried by the collar -37'and extendstransversely therethrough, havin'gia, small portion of its periphery projectingflintofthe bore 44 of the collar 37. When the drill bar guiding member 38 is in its upperdrill'bar engaging position, the portion of the pin 47, which projects'into the bore 44, engages inan annular'recess 50 formed in the. stem 38 at the; proper position, to hold the head '40 and lugs 4l and 42 in theproper position for supporting and guiding themovement of the drill bar A. To permit lowered movement of the member 38,'it is necessary to rotate the member 38 a quarter turn, so astobring the flattened-or cut-away portion 51' of the stem 39 facing the pin 47. The flattened portions 51 are of sufiicientedepth to clear the projecting portion of the .pin 47 andallow the member 38 to move downwardly 'intheicollar .37.. However,

the upper ends of'the cut-away portions 51 terminatein arcuate surfaces indicated at 52 which are curved, so as to substantially fit the portion of the periphery of thepinfl4'7, which projects into the bore 44 and thus, the lowered movement of the member 38 may be limited by the slots 51. if it is so desired, ,or, of course, the lowered movement may beRlimited by engagement of the under surface of thehead 40 with the upper end of the,collar 37.. In the modified form of hole spotter shown in Figures dtonlpninclusive of the drawings, like in the preferred form of the hole spotter shown in; Figures 1 to 5 i n clusive, the drill bar engaging member is" moved into and out of thedrill bar engaging and guidingposition,v by a sub- 'stantial quarter turn of the member, and in both forms, suitable means are provided, which are simple in. construction, .easy to operate and cheap to, manufacture, for holding. the drill -bar engaging member either in operative drill bar engaging position or in non-drill bar engaging position and out of the way of the drill bar.

;,It will beunderstoodthat the invention is not rangement of parts shown, but that it may be widely modified within the invention as defined by the claims.

What is claimed is:

1. In a hole spotter for collaring drill holes, an attaching and supporting member, a drill bar guide adjustably carried by said member and including a stem, a head on said stem, and a plurality of drill bar engaging lugs rigidly carried by said head, a guide pin carried by said stem, said attaching and supporting member provided with a guide way receiving said guide pin for guiding the movement of said drill bar guiding member.

2. In a hole spotter for collaring drill holes, an attaching and supporting member, a drill bar guide adjustably carried by said member and including a stem, a head on said stem, a plural- I ity of drill bar engaging lugs rigidly carried by said-head, a guide pin carried by said stem, said attaching and supporting member provided with a guide way receiving said guide pin for guiding the movement of said drill bar guiding member, and a locking member carried by said guide pin, said guide way provided with enlarged portions for receiving said locking member for locking said drill bar guide in adjusted position.

3. In a hole spotter for collaring adrill bar, an attaching and supporting member provided with a slot, a drill bar guide slidable in said member and being adapted to axially slide adjacent to and free from the drill bar, a guide pin carried by said guide and projecting through said slot to inhibit rotary motion of said guide in said member, when said guide is free from said drill bar.

4. In a hole spotter for collaring a drill bar, an attaching and supporting member provided with a right angled slot, a drill bar, guide slidable in said member and being adapted to axially slide adjacent to and free from the drill bar, a guide pin carried by said guide and projecting through said slot to inhibit rotary motion of said guide in said member, when said guide is free from said drill bar, and to permit rotary motion when said guide is adjacent to said drill bar, to allow said guide to engage said drill bar. I

5. In a hole spotter for collaring a drill bar,

an attaching and supporting member provided I with a slot, a drill bar guide slidable in said member and being adapted to axially slide ad-' jacent to and free from the drill bar, and to rotate from the adjacent position to allow said guideito engage said drill bar, and a guide pin carried by said drill bar, and projecting through said slot to inhibit axial movement of said guide when said guide engages said drill bar.

6. In a hole spotter for collaring a drill bar, an

attaching and supporting member provided with a right angled slot, a drillvbar guide slidable in said member and being adapted to axially slide adjacent to and free from the drill bar, a guide pin carried by said guide and projecting through said slot to inhibit rotary motion of said guide in said member, when said guide is free from said drill bar, and to permit rotary motion when said guide is adjacent to said drill bar, to allow said guide to engage said drill bar, and meansat either end of said slot to engage said guide pin, to lock said guide respectively in the engaged and the free position. 

